Dinosaurs

< Extinct Animals < Animals < roxyriley

Dinosaurs are an extinct group of reptiles that differ from all modern lizards in that their legs were directly under their bodies. There are two major groups of dinorsaurs:
1) Ornithiscia- these dinosaurs include the wide array of herbivorous dinosaurs like Triceratops, Stegosaurus, and Iguanodon; and 2) Saurischia: these dinosaurs include the meat-eating dinosaurs as well as the giant long-necked dinosaurs which could weigh up to 100 tons. Birds are descended from Saurischian dinosaurs and are the closest living relatives to dinosaurs alive today. Apr 28

Dinosaurs of a Feather Come Together: Photos

Bird mimic. This dinosaur from Canada, which resembles an ostrich and bears traces of feathers on its body and limbs, may provide clues to the origins of winged flight. Credit: Royal Tyrrell Museum

When Did Dino's Sprout Wings?

The discovery may prove once and for all that dinosaurs ' hairlike filaments—sometimes called dino fuzz—are related to bird feathers, paleontologists announced today. ( Pictures: Dinosaur True Colors Revealed by Feather Find. ) The finding may also open up a new world of prehistoric color, illuminating the role of color in dinosaur behavior and allowing the first accurately colored dinosaur re-creations, according to the study team, led by Fucheng Zhang of China's Institute for Vertebrate Paleontology . The team identified fossilized melanosomes—pigment-bearing organelles—in the feathers and filament-like "protofeathers" of fossil birds and dinosaurs from northeastern China.

Dinosaur True Colors Revealed for First Time by Feather Study

15 September 2011 Last updated at 13:22 ET A wide array of different feather shapes was captured in the same place within just a few years Samples of amber in western Canada containing feathers from dinosaurs and birds have yielded the most complete story of feather evolution ever seen.

Dinosaur feather evolution trapped in Canadian amber

Theropod dinosaur evolution into Birds

5 Bizarre Dinosaurs You Didn't Know Existed

Admit it, everything you know about dinosaurs you learned from watching Jurassic Park .

Museum features two T-rex's going at it

Spinosaurus

Veg-O-Matic chompers. The teeth of the duck-billed dinosaur Edmontosaurus had six different tissues ( five shown at lower right ) which allowed it to eat tough plant material.

Cows of the Cretaceous

Longest Dinosaurs

Dinosaur Skull Collection: Archaeopteryx

Troodon: the Smartest Dinosaur

Velociraptor ( pron.: / v ɨ ˈ l ɒ s ɨ r æ p t ər / ; meaning 'swift seizer') [ 1 ] is a genus of dromaeosaurid theropod dinosaur that lived approximately 75 to 71 million years ago during the later part of the Cretaceous Period . [ 2 ] Two species are currently recognized, although others have been assigned in the past.

Velociraptor - Predatory Behavior

Velociraptor and Protoceratops

This pictures shows a Velociraptor and Protoceratops who seem to have died in mortal combat. This is perhaps the best specimen of active predation ever found. It seems both animals were instantaneously smothered when a sand dune collapsed. by roxyriley Apr 20

Egg-laying beginning of the end for dinosaurs

Apr. 16, 2012 — Their reproductive strategy spelled the beginning of the end: The fact that dinosaurs laid eggs put them at a considerable disadvantage compared to viviparous mammals.